Stress distribution around Fe5Si3 and its effect on interface status and mechanical properties of Si3N4 ceramics

doi:10.1111/jace.15240

	Stress distribution around Fe5Si3 and its effect on interface status and mechanical properties of Si3N4 ceramics
	Wang, Lujie 1; Qi, Qian 1; Wu, Haibo ; Zhang, Hui ; Yin, Jie ; Yang, Yong ; Huang, Jian ; Yang, Xiao ; Liu, Xuejian ; Huang, Zhengren
刊名	JOURNAL OF THE AMERICAN CERAMIC SOCIETY
	2018
卷号	101 期号:2 页码:856
关键词	iron iron compounds mechanical properties silicon nitride thermal expansion
ISSN号	0002-7820
DOI	10.1111/jace.15240
英文摘要	Si3N4 ceramics with different amount of Fe5Si3 were prepared by adding FeSi2. Residual thermal stress distribution and elastic energy around Fe5Si3 particles in various depths were calculated. The interface status between second phase particles and matrix was analyzed in terms of stress and energy. High tangential compressive stresses and low radial tensile stresses were generated along the surface of the ceramics. Elastic strain energy caused by unit interface was high around big particles in deep area of the ceramics. Microcracks are observed around the big Fe5Si3 particles. Furthermore, accord to our calculation, microcracks are easily generated around particles in superficial layer of matrix when second phase particles have lower thermal expansion coefficient than the matrix, while microcracks tend to be generated in deep layer of matrix preferentially when the thermal expansion coefficient of second phase particles is higher than matrix. Residual stresses and microcracks around Fe5Si3 particles greatly influenced mechanical properties. Fracture toughness of Si3N4 ceramics with similar Si3N4 particle size distribution increased with the amount of Fe5Si3, and fine Fe5Si3 particles could enhance the strength of Si3N4 ceramics. Si3N4 ceramics exceeding 1.2 GPa strength were prepared.
学科主题	Materials Science, Ceramics
出版者	WILEY
WOS记录号	WOS:000416933700039
资助机构	Shanghai Institute of Ceramics, Chinese Academy of Sciences ; Shanghai Institute of Ceramics, Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/24530]
专题	中国科学院上海硅酸盐研究所
作者单位	1.Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Wang, Lujie,Qi, Qian,Wu, Haibo,et al. Stress distribution around Fe5Si3 and its effect on interface status and mechanical properties of Si3N4 ceramics[J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY,2018,101(2):856, 864.
APA	Wang, Lujie.,Qi, Qian.,Wu, Haibo.,Zhang, Hui.,Yin, Jie.,...&Huang, Zhengren.(2018).Stress distribution around Fe5Si3 and its effect on interface status and mechanical properties of Si3N4 ceramics.JOURNAL OF THE AMERICAN CERAMIC SOCIETY,101(2),856.
MLA	Wang, Lujie,et al."Stress distribution around Fe5Si3 and its effect on interface status and mechanical properties of Si3N4 ceramics".JOURNAL OF THE AMERICAN CERAMIC SOCIETY 101.2(2018):856.